Malicious PDF — malware analysis report

Static analysis result for SHA-256 5431698cc8c6d307…

MALICIOUS

PDF

84.9 KB Created: 2021-09-13 10:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21c8dae28013d05c88d629a781a68d45 SHA-1: c42904fc6f3ae6b50b2c166c31dc1aa7f1fcfeb5 SHA-256: 5431698cc8c6d307e9d7413d058461db02cd91d748233c637bd2bc8dde2b2a17
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or credential harvesting attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=play+magnus+mod+apk PDF link annotation
    • https://rh-h1tapi-turbo.com/contents/files/lozerugun.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/rawifamomaduru.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132a6cc4da2c---42501027696.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/kovizuruvikizilorarawiw.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/baxufofotinejogibeketak.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/vifivufilexumajifawojuxog.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/85195456995.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/655734710.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/d3742bd61a550df6e48a8ddc022d7ac8/menunogigapijojoxaxuf.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/41851264677.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/20618150900.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/dolatubamasipowopivowosut.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/43736489487.pdfIn PDF document text
    • http://sofar-france.com/userfiles/file/xiridavow.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/78660918476.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xopez.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/56134546710.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/98179236297.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ecb02a0d---vazezu.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/nikusi.pdfIn PDF document text
    • http://getem.eu/files/file/vuweko.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355c2618100---vepozowipaxixuz.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/15537631257.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/zipuxagagejotozusowe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 10620 bytes
SHA-256: a6e70ec1f395f84afc6c77a55cb7f053f147b16a2188051f786c382f5c9d1465
font_01_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 19852 bytes
SHA-256: 5fbf47a09c1e40017d479e6eece2b31ca4fd001522427ef0140e8445f515a1bb
font_02_sfnt_off00012e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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